Denial of Service in Helidon

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Oracle

Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-18

Last Modified

2026-08-18

Generated

2026-08-19

AI Q&A

2026-08-19

EPSS Evaluated

N/A

NVD

CVE-2026-73936

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	helidon	4.5.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a denial-of-service (DoS) vulnerability in Oracle Helidon 4.5.1's Imperative Web Server. An unauthenticated attacker can remotely crash the server by sending malicious HTTP requests, causing it to hang or repeatedly crash without requiring any user interaction.

Impact Analysis

If you use Oracle Helidon 4.5.1, an attacker could exploit this to make your web server unavailable, disrupting services and causing downtime. This could affect applications relying on Helidon for web functionality.

Mitigation Strategies

Apply the latest security patches or updates for Oracle Helidon version 4.5.1 from Oracle. If patches are unavailable, consider disabling the Imperative Web Server component or restricting network access via firewalls to prevent HTTP-based attacks.

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